Confirmed by detection of CMV in bronchoalveolar lavage or lung biopsy. Reported overall and separately for those whose preemptive management was and was not modified (postponed or foregone or limited to a false start) and compared to corresponding incidence in a similar cohort at our institution.

Secondary Outcome Measures:

CMV reactivation-free survival, monitored using a real time PCR assay for CMV DNA in plasma [ Time Frame: Up to day 100 post-transplant ] [ Designated as safety issue: No ]

Modeled using proportional hazards regression. Primary risk factors will be donor KIR of interest (activating KIR2DS2 and 2DS4, inhibitory KIR2DL1, 2DL2/2DL3, 3DL1, 3DL2), together with their recipient ligands where known. Potential confounding factors to be controlled in the model will include established clinical risk factors, including pretransplant CMV serostatus of donor and recipient, unrelated donor, marrow versus peripheral blood stem cells, and onset of acute graft-versus-host disease, handled as a time-dependent variable. The proportionality of hazards over time will be verified.

I. To evaluate the efficacy and safety of a individualized strategy for cytomegalovirus (CMV) preemptive management, one that monitors CMV viral load and clinical markers of immunosuppression to optimize use of ganciclovir in recipients of allogeneic hematopoietic cell transplantation (HCT) who experience CMV reactivation.

II. To investigate whether markers of natural killer (NK) cell function correlate with a) KIR/ligand compound genotype and baseline or concurrent clinical factors and b) with history of CMV reactivation and anti-CMV therapy at the time of NK cell collection.

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Please refer to this study by its ClinicalTrials.gov identifier: NCT01199562